[Malignant fibrohistiocytoma coexisting with papillary tumor of the kidney pelvis: report of a case].

Presentation of one case of malignant fibrohistiocytoma in one patient seen for gross clotting haematuria during the study of which the coexistence of this tumour with a renal pelvis papillary one was discovered. The disease's clinical and diagnostic aspects are commented, with special emphasis on histological diagnosis. A review of the existing literature is also made.